Heat-conducting tube



Dec. 3, 1935. T. E. MURRAY HEAT CONDUCTING TUBE Original Filed June 18, 1924.

Reima! Dee. 3, 1935- UNITED STATES In certain prior applications, Nos. 642,427, filed May 31, 1923 and 642,725, filed June 1, 1923 (Patent No. 1,746,711, February 11, 1930, Reissue No. 18,748, February 28, 1933), I have described a certain hollow construction for walls and other parts of boilers or heaters and made up of tubes of rectangular, circular or irregular cross-section with fins orflanges extending lengthwise thereof so heating gases greater than the surface which is in contact with the water or other fluid in the tube.

bodiments of the invention.

Fig. 1 is a horizontal section of a side wall of a boiler built with the tubular umts of the invention;

with the invention;

Fig. 3 is a perspective view of another unit;

Fig. 4 is a longitudinal section of the same;

In another application pending concurrently herewith Serial No. 715,369, led May 23, 1924, (which has since matured into Patent No. 1.844.407 Vdated February 9,- 1932). I have described a certain style of unit'for use in the building of such walls or screens. The present application is directed to units of different styles specifically from those described in the said application and in other applications which I have pending.

According'to Fig. l the boiler wall is provided with a lining or screen comprising tubes I with anges 2 which are of zig-zag shape so as to provide an extended width of surface within a comparatively short space between the tubes; the edges of the flanges from adjacent tubes being overlapped and hooked into engagement with each other so as to hold them close together in spite of distortion under heat. Back of the screen thus formed is an ordinary wall which may, for example, be made of refractory bricks 3 and insulating tiles I held by a sheet steel casing l.

The increased superficial area of the fins or flanges may be secured in various other ways than by bending. For example, in Fig. 2 the developed flange is formed of a common rolled shape 3 which in turn is provided with flanges 1 on its side faces. Thus the developed width of the surface exposed is very much greater .than the overall width projected in a straight line. This `nange is fastened by butt welding as at I to a seamless steel tube. Various other methods may beusedfor assembling theparts,

miss HEAT-'conundrum TUBE Thomas E. Murray, deceased, late of Brooklyn. Y., by Thomas E. Murray, Jr., Joseph B. Murray, and John F. Murray, executors, Brook- Iyn, N. Y., assignors to Metropolitan Engineering Company, a corporation of New York original No. 1,146,212, atea February 11, 193s, Serial No. 720,734, June 18, 1924. Application for reissue 30, 1932, Serial No. 589,964

4 Claims. (Cl. 257-262) as to provide a heating surface exposed to the` The present invention provides a unit from f which such boiler wallsand the like may be built. The accompanying drawing illustrates em- Fig. 2 isa plan of a uni'tmade in accordance Re. 19,782 A PATENT oFFlcE Instead of getting the extended surface by use of a single flange member as in Fig. 2, it may be obtained by using a number oi such members separately fastened to the tube. See Fig. 3. Here the tube has a number of rods 9 extending lengthwise and located at intervals around the outside of a portion of the tube. 'I'he same arrangement may be repeated at the opposite portion of the same side of the tube. The rods 9 may be of rectangular or other cross-section, lnstead of the round shape shown, and of differing dimensions, and they may be united to the tube in various ways.

According to Fig. 4, I have shown each of the rods 9 'welded at intervals in its length, as at lli, 15 to the outside of the seamless tube. The intermediateparts of the rod may be in close contact with the tube, or may be slightly separate therefrom as illustrated.

As described in Murray application No. 715,369, above referred to, the tubes may be of various shapes, and the flanges may be of various compositions or may be specially coated to increase their resistance to oxidation by the name.

Though I have described with great particularity of detail certain embodiments of my invention, yet it is not to be understood therefrom that the invention is restricted to the .particular embodiments disclosed. Various modifications may be made by those skilled in the art without go departing from the invention as defined in the following claims.

What I claim is:

1. A heat conducting unit for boilers constituting a separateand complete article of manufacture and comprising a long, small-diameter, thinwalled, steel boiler tube adapted to carry water with a longitudinal flange extending the full length of the tube and adapted for exposure to heating gases, said ange having'an exposed 40 side face which is uneven and is of greater developed width than the projected width of the flange itself so as to present an extended surface to the heating gases, the tube having a continuous wall of uniform'thickness throughout its cir- 45 cumference and the flange being a Separately formed piece welded at one edge to the outer face of the tube and having its other edge free.

2. The heat conducting unit of claim 1, the flange being a strip of sheet metal of uniform 5o thickness and zig-zag cross-section.

3. The combination of a plurality of heat oonducting units for boilers separate from but adjacent to each other, each comprising a tubular member adapted to carry water and longitudinal flanges on opposite sides extending the full length ot the unit and adaptedfor exposure to the heating gases, said ilanges being welded to thetubular members but unconnected. to each other, the flange of one unit having a hook-shaped portion engaging the adjacent edge ot the ilange of the next unit to hold them together under distortion b y heat. 4. A heat conducting unit for boilers-or heaters, said unit constituting a separate and complete article of manufacture and comprising a long. small-diameter, thin walled steel tube adapted to carry iluld with a longitudinal ilange extending over substantially the entire length of the tube and adapted for exposure to heating gases. said ilange having an exposed side face which-is uneven and is of greater developed width thantheprojectedwidthoftheangeitselisoas to presentan extended surface to the heating gases, the tube having a` continuous wall and the flange being separately formed and welded at one edge to the outer tace o! the tube and having its other edge i'x'ee.A 4 I THOMAS E. MURRAY. Jn. JOSEPH B. MURRAY, vJOHN F. MURRAY.

Ezecutore of the Estate ol Thomas E. Murray, 

